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Self Aligning Multiangular and Dual Axis Displacement Power Screw Mechanism

IP.com Disclosure Number: IPCOM000087671D
Original Publication Date: 1977-Mar-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Daniels, RA: AUTHOR [+2]

Abstract

This relates to means for mounting a pair of drive lead screws such that misalignment is eliminated. The mechanism provides both dual-axis displacement and multiangular displacement so that two positively driven power screws do not bind because of axial and angular displacement and/or misalignment, due in great measure to the use of a spherical ball nut with a self-contained antirotation stud.

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Self Aligning Multiangular and Dual Axis Displacement Power Screw Mechanism

This relates to means for mounting a pair of drive lead screws such that misalignment is eliminated. The mechanism provides both dual-axis displacement and multiangular displacement so that two positively driven power screws do not bind because of axial and angular displacement and/or misalignment, due in great measure to the use of a spherical ball nut with a self- contained antirotation stud.

The figure shows plates 4 and 11 which are opposite sides of a truck mechanism to be moved by powered lead screws 3 and 8. Plates 4 and are rigidly joined together by other truck structural members (not shown). Lead screw 8 is fastened to truck plate 11 by nuts 6 and 7 where those nuts are mounted to plate 11 by screws 9 and 10. Nut 6 has movement with respect to the X axis direction equal to the pitch height of the power screws 3 and 8, therefore preventing a binding problem between nuts 6 and 7 due to thread misalignment when power screw 8 is operating. The design is such that there is essentially no backlash between power screw 8 and nuts 6 and 7.

Lead screw 3 is fastened to truck plate 4 by a spherical ball nut 2 with an antirotation stud 13 as an integral part thereof. Spherical nut 2 is assembled in housing 1 with a slight interference fit to give zero backlash in the X axis direction. Power screw 3 threads through nut 2. Housing 1 with nut 2 and screw 3 is mounted to plate 4 by screws 5. The...